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Python library has built-in pow() function. It also has pow() function in math module. What's the difference? |
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Answer» Built-in pow() function has two variations - with two arguments and three arguments. The pow() function with two arguments returns first argument raised to second argument. That means pow(x,y) results in x to the power y >>> pow(10,2) 100The two-argument form pow(x, y) is equivalent to using the power operator: x**y. The pow() function can take three arguments. In that case, pow(x,y,z) returns pow(x,y)%z. It returns modulo division of x to the power y and z. >>> pow(10,2) 100 >>> pow(10,2,3) 1This is equivalent TO10**2%3 which is 100%3 = 1 The pow() function from math module only has a two argument version. Both the arguments are treated as float. Hence the result is always float even if arguments are INT. >>> math.pow(10,2) 100.0 >>> pow(10,2) 100Because of the FLOATING point representation in the memory, result of math.pow() may be inaccurate for integer arguments. Hence for INTEGERS it is advised to use built-in pow() function or ** operator. |
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